Governor for steam-engines



3 Sheets-Sheet 1.

(No Model.)

B..JOHNSON. GOVERNOR FOR STEAM ENGINES.

' No. 532,734. v I Patented Jan. 15

3 Sheets-Sheet 2.

' (No Model.)

' B. JOHNSON.

GOVERNOR FOB. STEAM ENGINES.

Patented Jan. 15, 1895.

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' SSheet-Sheet 3. B. JOHNSON. GOVERNOR FOR STEAM ENGINES;

N0. 532,734. Patented Jam. 15, 1895.

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Ni'rnn STATES PATENT OFFICE.

BILLIE JOHNSON, OF MOUNTAIN PEAK, TEXAS.

GOVERNOR FOR STEAM-ENGINES.

SPECIFICATION forming part of Letters Patent No. 532,734, dated January15, 1895. Application filed August 22,1894. Serial No. 5ZL 26- (Nomodel.)

To all whom it may concern.-

Be it known that I, BILLIE'JOHNSON, a citizen of the United States,residing at Mountain Peak, in the county of Ellis and State of Texas,have invented a new and useful Governor for Steam-Engines, of which thefollowing is a specification.

My invention relates to governing devices for steam and other engines,the objects in a similar view showing the parts expanded.

Fig. 3'is a vertical central section parallel with the axis of rotationof the wheel. Fig. 4 is a detail view in perspective of one of thecentrifugal levers. Fig. is a detail sectional view of one oftheadjustable collars. Fig. 6 is a detail view in perspective of the meansfor communicating motion to the members of the eccentric.

Like numerals of reference indicate like parts in all the figures of thedrawings.

1 designates a shaft carrying a pulley or other wheel 2 and within andcarried by the wheel is a centrifugal weighted lever 3 pivoted at oneend by means of a bolt 4 arranged in a bracket 5 and provided at itsother or free end with an extension 6 to which is connected one end of atension spring 7. The otherend of this tension spring is connected toone arm of a rocking lever '8 fulcrumed at an intermediate point to ablock 9 fixed, in the construction illustrated in the drawings, to theinner surface of the rim of the pulley or wheel. The other arm of saidrocking lever is connected by means of an extensible tension regulatingrod 10 to the free end of the lever 3. Said connecting rod 10 comprisesindependent relatively adj ustable sections or members united by a rightand left screw threaded sleeve or nut 11 and it is obvious that byturning said sleeve or nut the members or sections of the connect ingrod may be drawn toward or moved from each other to vary the tension ofthe spring 7.

- sleeveoarries the inner member or core 18 of a. double eccentric, saidinner member or core being provided with a peripheral groove 19 whichreceives a web 20 on the exterior member or ring 21 of said doubleeccentric, the inner member or core being provided with a removablecheek plate 22 held in place by bolts 23 to facilitate the assembling ofthe parts of the double eccentric. Connected to the eccentric 'by' meansof a yoke 24 of the ordinary or any preferred construction is a stem 25.This stem may be the valve stem of the engine but in the constructionillustrated in the drawings, it is an intermediate part between theeccentric and a rocker 26 consisting of the parallel arms 27 and 28connected by the shaft 29, a valve stem 30 being oonnectedto the arm 27.

Removably and adjustably connected to a flange or extension 31 of theexterior member or ring of the double eccentric is a collar 32 which issimilar in construction to the collar 17 which is attached to the sleeve16, and therefore it will be seen that one of the collars is attached toeach of the members of the double eccentric.

Pivotally connected to the compensating block 14 at points near thecenter thereof are the extremities of links 33, the opposite ends ofsaid links being connected to the outer arms of rocking levers 34. Theinner arms of said levers 34. are connected by means of links 36 to thecollars 17 and 32 respectively.

From the above description,it will be seen that when the rotation of thewheel or pulley is suificiently rapid to cause an outward movement ofthe lever 3 due to centrifugal force the links 33 will cause a-rockingmove- ICC ment of the levers 3t and the motion of the lattercommunicated through the short links 35 will cause the collars 17 and 32to turn in opposite directions thus turning the members of the doubleeccentric respectively in opposite directions and either increasing ordiminishing the eccentricity according to the relative adjustment of themembers prior to such movement.

It will be understood that the members of the eccentric are soconstructed that when the enlarged portion of one member is radiallyopposite the reduced portion of the other member the axis of theeccentric will be con centric with the outer periphery of the exteriormember, and therefore when said members occupy these relative positions,no motion will be imparted to the connected stem or other part of themachine.

In the foregoing description, I have referred to a single constructioninvolving a certain combination of elements for imparting oppositerotary movements to the members of the double eccentric, but in order tosecure uniformity of movement and efficiency with a high speed ofrotation of the wheel or pulley to which the mechanism is applied, Iprefer to duplicate said combination of elements and arrange the same indiametrically opposite positions in the wheel or pulley. By such anarrangement I secure an equalization of strain in opposite directionsupon each of the collars l7 and 32 and hence upon each of the members ofthe double eccentric, thus avoiding cramping or binding of the parts.

In addition to the above described mechanism I employ an adjustableweight attached to each of the centrifugal levers for increasing ordiminishing the weight of the free end thereof and thus varying thespeed at which such lever will be thrown outward by the centrifugalforce caused by the rotation of .the wheel or pulley. This weight 36 isfitted upon a guide 37 which is removably fitted at its extremities insockets 38 formed at the ends of a recess 39 in the outer side ofthelever. Said extremities of the guide bar 37 are held in place to theseats 38 provided therefor by means of blocks 40 carried by a scale bar41. Said scale bar is provided with graduations and the adjustableweight 36 is provided with a pointer 42 and when the weight is arrangedin a given position the pointer carried thereby will indicate byreference to the graduated scale bar the number of revolutions of thewheel or pulley per minute required to turn the members of the doubleeccentric into such relative positions that all steam will be cut oiffrom the cylinder of the engine.

The adjustable weight is secured at the desired point of the guide barby means of a set screw l3. Suitable stop pins 44 are provided forlimiting the outward movement of the free ends of the centrifugallevers.

In order to provide for more or less movement of the exterior member orring of the eccentric iu proportion to the movement of the centrifugallevers I provide the collar with recesses 45 in which are fitted studs46 by which connection is formed between the collar and the extremitiesof the short links 36. These studs are adjustable radially on thecollar, pins 47 being provided to engage perforations in the studs tosecure them at the desired adjustment, and it will be seen that byarranging the studs at a greater or less extension the communication ofmotion to the collar from the other parts of the apparatus may bevaried.

The operation of the improved governing mechanism will be fullyunderstood from the foregoing description and it will be obvious that inadapting the same to various forms and styles of engines various changesin the form, proportion and the minor details of construction may beresorted to without departing from the spirit or sacrificing any of theadvantages of the invention.

Having thus described my invention, what I claim is- 1. The combinationwith a wheel or pulley of a double eccentric arranged upon the axis ofthe wheel or pulley, an eccentric yoke and connections, oppositecentrifugal levers carried by the wheel or pulley, rocking leversfulcrumed at intermediate points and carried by the centrifugal levers,connections between the inner ends of said rocking levers and themembers of the double eccentric respectively, and connections betweensaid centrifugal levers and the outer extremities of the rocking leverswhereby when the centrifugal levers are operated the members of theeccentric are rotated in opposite directions, substantially asspecified.

2. The combination with a wheel or pulley of a double eccentric arrangedupon the axis of the wheel or pulley, an eccentric yoke and connections,a centrifugal lever carried by the wheel or pulley, a compensating blockcarried by the centrifugal lever and fulcrumed at an intermediate pointthereto, and connections between said compensating block and the membersof the eccentric, substantially as specified.

3. The combination of a wheel or pulley of a double eccentric arrangedupon the axis of the wheel or pulley, an eccentric yoke and connections,oppositely disposed centrifugal levers fulcrumed at their extremitiesupon the wheel or pulley, intermediate fulcrumed compensating blockscarried respectively by the centrifugal levers, rocking levers fulcrumedto the extremities of thecompensating blocks and connected at theirinner ends in pairs to the members of the eccentric, and linksconnecting intermediate points of the compensating blocks to the outerextremities of said rocking levers, the links which are attached to thecenter of one compensating block being connected to the extremities ofthe rocking levers of the other compensating block, substantially asspecified.

4: The combination with a wheel or pulley of a double eccentric arrangedon the axis of the wheel or pulley and having concentric sleeves orextensions, centrifugal levers carri ed by the wheel or pulley,intermediate rocking levers connected with the centrifugal levers, linksconnected to the said intermediate levers, and adjustable connectionsbetween said links and the extensions of the members of the eccentric,substantially as specified.

5. The combination with a wheel or pulley of a double eccentric arrangedupon the axis thereof and provided with concentric extensions, collarsadjustably secured to the said concentric extensions, centrifugal leverscarried by the wheel or pulley, intermediate rockinglevers operativelyconnected with the centrifugal levers and connections between saidrocking levers and the said collars, sub stantially as specified.

6. Thecombinatiou with a wheel or pulley, of a double eccentric arrangedupon the axis thereof and having an outer member or ring and an innermember or core fitting within said outer member or ring, the innermember having a removable cheek plate to facilitate its arrangementwithin the outer member or ring, an eccentric yoke and connections,centrifugal levers arranged upon the wheel or pulley, and connectionsbetween said levers and the members of the eccentric, substantially asspecified.

7. The combination with a wheel or pulley of a double eccentric arrangedupon the axis thereof, an eccentric yoke and connections, a centrifugallever carried by the Wheel or pulley and pivoted at one end thereto,connections between the centrifugal lever and the members of theeccentric whereby the latter are turned relatively in oppositedirections, and a tension regulatingdevicecomprising a contractilespring attachedat one end to the free end of the centrifugal lever, arocking lever fulcrumed at an intermediate point to a bracket fixed tothe wheel ,or pulley and having one arm connected tosaid spring, and

an extension rod having relatively adjustable ugal lever carried by thewheel or pulley and fulcrumed at one extremity thereto, connectionsbetween said lever and the eccentric, means for normally holding thefree end of the centrifugal lever from outward movement, and anadjustable weight carried by the lever, substantially as specified.

9. The combination with a wheel or pulley,

of an eccentric arranged upon the axis thereof, an eccentric yoke andconnections, a centrifugal lever carried by and fulcrumed at one end tothe wheel or pulley, connections be-. tween said pulley and theeccentric, a yield ing connection between the free end of the lever andthe fixed part of the wheel or pulley, a weight mounted upon a guidecarried by the centrifugal lever, means for locking said weight at thedesired adjustment, and a graduated scale bar arranged contiguous to theweight, substantially as specified.

10. The combination with a wheel or pulley of an eccentric arranged uponthe axis thereof, an eccentric yoke andconnections, a centrifugal levercarried by and fulcrumed at one end to the wheel or pulley, connectionsbetween said centrifugal lever and the eccentric,

means for normally holding the free end of the centrifugal leverfromoutward movement, a guide bar fitted in seats in the centrifugal lever,removable blocks for holding the extremities of said guide bar in theseats, a weight slidably mounted upon the guide bar and carrying apointer or indicator, means for locking the weight at the desired pointof the guide bar, and a graduated scale arranged parallel with the guidebar, substantially as specified.

In testimony that I claim the foregoing as my own I have hereto affixedmy signature in the presence of two witnesses.

BILLIE JOHNSON. Witnesses:

S. M. MOOLANAHAN, L. E. ESKRIDGE.

